Advisories ยป MGASA-2015-0113

Updated libxfont package fixes security vulnerabilities

Publication date: 23 Mar 2015
Type: security
Affected Mageia releases : 4
CVE: CVE-2015-1802 , CVE-2015-1803 , CVE-2015-1804


The bdf parser reads a count for the number of properties defined in
a font from the font file, and allocates arrays with entries for each
property based on that count.  It never checked to see if that count
was negative, or large enough to overflow when multiplied by the size
of the structures being allocated, and could thus allocate the wrong
buffer size, leading to out of bounds writes (CVE-2015-1802).

If the bdf parser failed to parse the data for the bitmap for any
character, it would proceed with an invalid pointer to the bitmap
data and later crash when trying to read the bitmap from that pointer

The bdf parser read metrics values as 32-bit integers, but stored
them into 16-bit integers.  Overflows could occur in various operations
leading to out-of-bounds memory access (CVE-2015-1804).